package com.sky.service;/*
 * @author Fairy
 * @date 2025/11/22
 * @description UserServiceImpl类的详细描述
 */

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.aliyun.oss.common.utils.HttpUtil;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.impl.client.HttpClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.net.HttpURLConnection;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;
import java.util.SplittableRandom;

@Service
@Slf4j
public class UserServiceImpl implements UserService{
    // 微信登录接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信的接口服务，获得微信的用户的openid openid 是微信用户的唯一标识
        String openid = getOpenid(userLoginDTO.getCode());

        // 如果openid为空，如果为空表示登录失败，抛出业务异常
        if(openid == null){
          throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);

        // 如果是新用户自动注入新用户
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;
    }

    // 调用微信的接口服务，获得微信的用户的openid
    private String getOpenid(String code){
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN,map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}








